2024.4.24

今天写了一下发帖功能的Mainactivity.java文件
package com.example.photo1;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
private EditText editTextPost;
private RecyclerView recyclerViewSelectedImages, recyclerViewPosts;
private List imageUris = new ArrayList<>();
private List posts = new ArrayList<>();
private ImageAdapter imageAdapter;
private PostAdapter postAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

editTextPost = findViewById(R.id.editTextPost);
Button buttonSelectImages = findViewById(R.id.buttonSelectImages);
Button buttonUploadPost = findViewById(R.id.buttonUploadPost);
recyclerViewSelectedImages = findViewById(R.id.recyclerViewSelectedImages);
recyclerViewPosts = findViewById(R.id.recyclerViewPosts);

// Setup RecyclerView for selected images
recyclerViewSelectedImages.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
imageAdapter = new ImageAdapter(imageUris, this);
recyclerViewSelectedImages.setAdapter(imageAdapter);

// Setup RecyclerView for posts
recyclerViewPosts.setLayoutManager(new LinearLayoutManager(this));
postAdapter = new PostAdapter(posts, this);
recyclerViewPosts.setAdapter(postAdapter);

// Image selection launcher
ActivityResultLauncher<String[]> imagePickerLauncher = registerForActivityResult(
new ActivityResultContracts.OpenMultipleDocuments(),
uris -> {
if (uris != null && !uris.isEmpty()) {
imageUris.clear();
imageUris.addAll(uris);
imageAdapter.notifyDataSetChanged();
}
});

// Select images button event
buttonSelectImages.setOnClickListener(v -> imagePickerLauncher.launch(new String[]{"image/*"}));

// Upload post button event
buttonUploadPost.setOnClickListener(v -> uploadPost());
}

private void uploadPost() {
String postText = editTextPost.getText().toString().trim();
if (!postText.isEmpty() || !imageUris.isEmpty()) {
Post newPost = new Post(postText, new ArrayList<>(imageUris));
posts.add(newPost);
postAdapter.notifyDataSetChanged();
editTextPost.setText("");
imageUris.clear();
imageAdapter.notifyDataSetChanged();

Toast.makeText(this, "发表成功!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "请输入文字内容或插入图片！", Toast.LENGTH_SHORT).show();
}
}
}